I only used it maybe 2 times for clamp on Amps anyhow been trying to sell a few things, and I sold this today without realizing that the probes were only for measuring ohms I think. there was not a set to measure the AC volts I was trying to find a manual online but did not have much success. I see on one ebay that has 2 sets of probes just wondering if someone knows where i could fined a manual for it. I sold it for 50.00 btw